Andrew Fox
Institut d'Astrophysique de Paris (Paris, France)
Salle des séminaires Évry Schatzman, Institut d'Astrophysique de Paris
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| « Hot halos around high redshift protogalaxies » |
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Andrew Fox |
| Damped Lyman alpha (DLA) absorbers are the highest column density class of quasar absorption line systems. DLAs contain the majority of all the neutral gas in the Universe at redshifts 0-5, and likely represent the progenitors to disk galaxies like the Milky Way. In this talk I present a new VLT/UVES absorption line survey for ionized gas in DLAs, including the first detections of O VI absorption. These data show that both warm ionized and hot ionized gas phases are present. I will present measurements of the kinematics of the ionized gas, which suggest that the absorbers trace hot galactic outflows and/or the infall of shocked intergalactic gas. Finally I will discuss the contribution of the DLA plasma to the baryon and metal budgets, in the context of the "Missing Metal Problem" at high redshift. |
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vendredi 3 novembre 2006 - 11:00 Salle des séminaires Évry Schatzman, Institut d'Astrophysique de Paris |
| Page web du séminaire / Seminar's webpage |